TurnKey GNU/Linux is Debian with batteries included

TurnKey GNU/Linux is a free software project based very closely on Debian GNU/Linux. Under the hood a TurnKey system image is really just a slightly customized version of Debian that we optimized for a specific usage scenario by carefully pre-integrating a selection of Debian components. This provides users with a starting point that is closer to the end-result they want (i.e., compared with installing Debian from scratch).

Except for a few custom free software components, TurnKey system images are assembled from unmodified Debian binaries straight from the official Debian repositories.

Consequently, the licensing for individual software components included in TurnKey is mostly inherited from Debian.

What is the licensing for Debian GNU/Linux?

Debian is 100% free software. In practice, this means Debian only includes software components licensed under terms that are in compliance with its strict guidelines for what constitutes truly free software. As far as Linux distributions go, Debian is considered a purist as its criteria for licensing is amongst the strictest.

Debian includes free software from a variety of sources that are licensed under a variety of free software licenses. GPL, BSD and the Artistic License are the most common free software licenses in Debian, though there are others as well.